Re: Your system is too SLOW to play this!
So if I need to disable VSync or enable frame dropping for 60fps video on a 60Hz display to avoid the 'System too slow' message, surely that means my machine is not powerful enough to render 640x480 video @ 60fps?
Lots of google results indicate high Xorg cpu usage and poor performance could be related to modelines. I've noticed also I have 2 60Hz modes in nvidia-settings 1080_60 and 1080_60_0. The second one will ALWAYS give me slow video regardless if vsync is off or not.